实例化带括号或不带括号的类？

可能的复制品:
PHP 类实例化。使用还是不使用括号

我还没有找到任何关于这个的官方文件。但是没有括号的类是否被实例化并不重要——只要不涉及参数，对吗？

$car = new Car;

或者

$car = new Car();

但是有人能告诉我，在性能上是否有区别吗？哪种方法更正确？有什么官方文件吗？

22702 次浏览

小开

They're both correct ways, and I'm sure there isn't any difference in performance either.

小开

最佳答案

Any difference in performance is going to be absolutely negligible.

While both ways are fine, I personally would prefer using new Car(); because usually, a method is being called here, and function/method calls in PHP require (). Also, it's more consistent with instantiations that have parameters.

But in the end, it's down to taste. It doesn't matter which way you choose, but when you choose one, stick to it consistently!

小开

the first instantiation has no "official" reference. In the official php doc you alway find the second one. So, i'de prefere this for consistenscy. But it's all your choice